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amazonAmazonALAS2-2022-1833
HistoryAug 15, 2022 - 9:03 p.m.

Medium: kernel

2022-08-1521:03:00
alas.aws.amazon.com
23

7.8 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

7.1 High

AI Score

Confidence

High

0.001 Low

EPSS

Percentile

30.3%

Issue Overview:

An out-of-bounds write flaw was found in the Linux kernel’s framebuffer-based console driver functionality in the way a user triggers ioctl FBIOPUT_VSCREENINFO with malicious data. This flaw allows a local user to crash or potentially escalate their privileges on the system. (CVE-2021-33655)

The Linux kernel before 5.18.13 lacks a certain clear operation for the block starting symbol (.bss). This allows Xen PV guest OS users to cause a denial of service or gain privileges. (CVE-2022-36123)

An issue was discovered in the Linux kernel through 5.18.14. xfrm_expand_policies in net/xfrm/xfrm_policy.c can cause a refcount to be dropped twice. (CVE-2022-36879)

Affected Packages:

kernel

Note:

This advisory is applicable to Amazon Linux 2 (AL2) Core repository. Visit this FAQ section for the difference between AL2 Core and AL2 Extras advisories.

Issue Correction:
Run yum update kernel to update your system.

New Packages:

aarch64:  
    kernel-4.14.290-217.505.amzn2.aarch64  
    kernel-headers-4.14.290-217.505.amzn2.aarch64  
    kernel-debuginfo-common-aarch64-4.14.290-217.505.amzn2.aarch64  
    perf-4.14.290-217.505.amzn2.aarch64  
    perf-debuginfo-4.14.290-217.505.amzn2.aarch64  
    python-perf-4.14.290-217.505.amzn2.aarch64  
    python-perf-debuginfo-4.14.290-217.505.amzn2.aarch64  
    kernel-tools-4.14.290-217.505.amzn2.aarch64  
    kernel-tools-devel-4.14.290-217.505.amzn2.aarch64  
    kernel-tools-debuginfo-4.14.290-217.505.amzn2.aarch64  
    kernel-devel-4.14.290-217.505.amzn2.aarch64  
    kernel-debuginfo-4.14.290-217.505.amzn2.aarch64  
  
i686:  
    kernel-headers-4.14.290-217.505.amzn2.i686  
  
src:  
    kernel-4.14.290-217.505.amzn2.src  
  
x86_64:  
    kernel-4.14.290-217.505.amzn2.x86_64  
    kernel-headers-4.14.290-217.505.amzn2.x86_64  
    kernel-debuginfo-common-x86_64-4.14.290-217.505.amzn2.x86_64  
    perf-4.14.290-217.505.amzn2.x86_64  
    perf-debuginfo-4.14.290-217.505.amzn2.x86_64  
    python-perf-4.14.290-217.505.amzn2.x86_64  
    python-perf-debuginfo-4.14.290-217.505.amzn2.x86_64  
    kernel-tools-4.14.290-217.505.amzn2.x86_64  
    kernel-tools-devel-4.14.290-217.505.amzn2.x86_64  
    kernel-tools-debuginfo-4.14.290-217.505.amzn2.x86_64  
    kernel-devel-4.14.290-217.505.amzn2.x86_64  
    kernel-debuginfo-4.14.290-217.505.amzn2.x86_64  
    kernel-livepatch-4.14.290-217.505-1.0-0.amzn2.x86_64  

Additional References

Red Hat: CVE-2021-33655, CVE-2022-36123, CVE-2022-36879

Mitre: CVE-2021-33655, CVE-2022-36123, CVE-2022-36879

7.8 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

7.1 High

AI Score

Confidence

High

0.001 Low

EPSS

Percentile

30.3%